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Adds {{prev_post}} and {{next_post}} block helpers
closes #4799 - Adds a prev_next helper method called by {{prev_post}} and {{next_post}} - Shows correct template for if and else blocks - Adds unit tests
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cobbspur
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5015180474
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@ -37,6 +37,8 @@ coreHelpers.tags = require('./tags');
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coreHelpers.title = require('./title');
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coreHelpers.url = require('./url');
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coreHelpers.image = require('./image');
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coreHelpers.prev_post = require('./prev_next');
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coreHelpers.next_post = require('./prev_next');
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coreHelpers.helperMissing = function (arg) {
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if (arguments.length === 2) {
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@ -109,6 +111,8 @@ registerHelpers = function (adminHbs) {
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registerAsyncThemeHelper('meta_description', coreHelpers.meta_description);
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registerAsyncThemeHelper('meta_title', coreHelpers.meta_title);
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registerAsyncThemeHelper('post_class', coreHelpers.post_class);
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registerAsyncThemeHelper('next_post', coreHelpers.next_post);
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registerAsyncThemeHelper('prev_post', coreHelpers.prev_post);
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// Register admin helpers
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registerAdminHelper('asset', coreHelpers.asset);
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38
core/server/helpers/prev_next.js
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38
core/server/helpers/prev_next.js
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@ -0,0 +1,38 @@
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// ### prevNext helper exposes methods for prev_post and next_post - separately defined in helpers index.
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// Example usages
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// `{{#prev_post}}<a href ="{{url}}>previous post</a>{{/prev_post}}'
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// `{{#next_post}}<a href ="{{url absolute="true">next post</a>{{/next_post}}'
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var api = require('../api'),
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schema = require('../data/schema').checks,
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Promise = require('bluebird'),
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fetch, prevNext;
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fetch = function (options) {
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return api.posts.read(options).then(function (result) {
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var related = result.posts[0];
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if (related.previous) {
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return options.fn(related.previous);
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} else if (related.next) {
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return options.fn(related.next);
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} else {
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return options.inverse(this);
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}
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});
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};
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// If prevNext method is called without valid post data then we must return a promise, if there is valid post data
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// then the promise is handled in the api call.
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prevNext = function (options) {
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options = options || {};
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options.include = options.name === 'prev_post' ? 'previous' : 'next';
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if (schema.isPost(this)) {
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options.slug = this.slug;
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return fetch(options);
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} else {
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return Promise.resolve(options.inverse(this));
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}
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};
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module.exports = prevNext;
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126
core/test/unit/server_helpers/next_post_spec.js
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126
core/test/unit/server_helpers/next_post_spec.js
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@ -0,0 +1,126 @@
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/*globals describe, beforeEach, afterEach, it*/
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/*jshint expr:true*/
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var should = require('should'),
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sinon = require('sinon'),
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Promise = require('bluebird'),
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hbs = require('express-hbs'),
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utils = require('./utils'),
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// Stuff we are testing
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handlebars = hbs.handlebars,
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helpers = require('../../../server/helpers'),
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api = require('../../../server/api');
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describe('{{next_post}} helper', function () {
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describe('with valid post data - ', function () {
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var sandbox;
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beforeEach(function () {
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sandbox = sinon.sandbox.create();
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utils.loadHelpers();
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sandbox.stub(api.posts, 'read', function (options) {
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if (options.include === 'next') {
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return Promise.resolve({
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posts: [{slug: '/current/', title: 'post 2', next: {slug: '/next/', title: 'post 3'}}]
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});
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}
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});
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});
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afterEach(function () {
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sandbox.restore();
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});
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it('has loaded next_post helper', function () {
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should.exist(handlebars.helpers.prev_post);
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});
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it('shows \'if\' template with next post data', function (done) {
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var fn = sinon.spy(),
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inverse = sinon.spy(),
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optionsData = {name: 'next_post', fn: fn, inverse: inverse};
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helpers.prev_post.call({html: 'content',
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markdown: 'ff',
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title: 'post2',
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slug: 'current',
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created_at: new Date(0),
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url: '/current/'}, optionsData).then(function () {
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fn.called.should.be.true;
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inverse.called.should.be.false;
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done();
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}).catch(function (err) {
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console.log('err ', err);
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done(err);
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});
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});
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});
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describe('for valid post with no next post', function () {
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var sandbox;
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beforeEach(function () {
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sandbox = sinon.sandbox.create();
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utils.loadHelpers();
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sandbox.stub(api.posts, 'read', function (options) {
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if (options.include === 'next') {
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return Promise.resolve({posts: [{slug: '/current/', title: 'post 2'}]});
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}
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});
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});
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afterEach(function () {
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sandbox.restore();
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});
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it('shows \'else\' template', function (done) {
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var fn = sinon.spy(),
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inverse = sinon.spy(),
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optionsData = {name: 'next_post', fn: fn, inverse: inverse};
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helpers.prev_post.call({html: 'content',
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markdown: 'ff',
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title: 'post2',
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slug: 'current',
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created_at: new Date(0),
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url: '/current/'}, optionsData).then(function () {
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fn.called.should.be.false;
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inverse.called.should.be.true;
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done();
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}).catch(function (err) {
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done(err);
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});
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});
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});
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describe('for invalid post data', function () {
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var sandbox;
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beforeEach(function () {
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sandbox = sinon.sandbox.create();
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utils.loadHelpers();
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sandbox.stub(api.posts, 'read', function (options) {
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if (options.include === 'previous') {
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return Promise.resolve({});
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}
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});
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});
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afterEach(function () {
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sandbox.restore();
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});
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it('shows \'else\' template', function (done) {
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var fn = sinon.spy(),
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inverse = sinon.spy(),
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optionsData = {name: 'next_post', fn: fn, inverse: inverse};
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helpers.prev_post.call({}, optionsData).then(function () {
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fn.called.should.be.false;
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inverse.called.should.be.true;
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done();
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}).catch(function (err) {
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done(err);
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});
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});
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});
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});
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127
core/test/unit/server_helpers/prev_post_spec.js
Normal file
127
core/test/unit/server_helpers/prev_post_spec.js
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@ -0,0 +1,127 @@
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/*globals describe, beforeEach, afterEach, it*/
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/*jshint expr:true*/
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var should = require('should'),
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sinon = require('sinon'),
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Promise = require('bluebird'),
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hbs = require('express-hbs'),
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utils = require('./utils'),
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// Stuff we are testing
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handlebars = hbs.handlebars,
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helpers = require('../../../server/helpers'),
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api = require('../../../server/api');
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describe('{{prev_post}} helper', function () {
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describe('with valid post data - ', function () {
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var sandbox;
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beforeEach(function () {
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sandbox = sinon.sandbox.create();
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utils.loadHelpers();
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sandbox.stub(api.posts, 'read', function (options) {
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if (options.include === 'previous') {
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return Promise.resolve({
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posts: [{slug: '/current/', title: 'post 2', previous: {slug: '/previous/', title: 'post 1'}}]
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});
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}
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});
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});
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afterEach(function () {
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sandbox.restore();
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});
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it('has loaded prev_post helper', function () {
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should.exist(handlebars.helpers.prev_post);
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});
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it('shows \'if\' template with previous post data', function (done) {
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var fn = sinon.spy(),
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inverse = sinon.spy(),
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optionsData = {name: 'prev_post', fn: fn, inverse: inverse};
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helpers.prev_post.call({html: 'content',
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markdown: 'ff',
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title: 'post2',
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slug: 'current',
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created_at: new Date(0),
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url: '/current/'}, optionsData).then(function () {
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fn.called.should.be.true;
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inverse.called.should.be.false;
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done();
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}).catch(function (err) {
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console.log('err ', err);
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done(err);
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});
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});
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});
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describe('for valid post with no previous post', function () {
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var sandbox;
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beforeEach(function () {
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sandbox = sinon.sandbox.create();
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utils.loadHelpers();
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sandbox.stub(api.posts, 'read', function (options) {
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if (options.include === 'previous') {
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return Promise.resolve({posts: [{slug: '/current/', title: 'post 2'}]});
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}
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});
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});
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afterEach(function () {
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sandbox.restore();
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});
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it('shows \'else\' template', function (done) {
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var fn = sinon.spy(),
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inverse = sinon.spy(),
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optionsData = {name: 'prev_post', fn: fn, inverse: inverse};
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helpers.prev_post.call({html: 'content',
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markdown: 'ff',
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title: 'post2',
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slug: 'current',
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created_at: new Date(0),
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url: '/current/'}, optionsData).then(function () {
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fn.called.should.be.false;
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inverse.called.should.be.true;
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done();
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}).catch(function (err) {
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done(err);
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});
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});
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});
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describe('for invalid post data', function () {
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var sandbox;
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beforeEach(function () {
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sandbox = sinon.sandbox.create();
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utils.loadHelpers();
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sandbox.stub(api.posts, 'read', function (options) {
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if (options.include === 'previous') {
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return Promise.resolve({});
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}
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});
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});
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afterEach(function () {
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sandbox.restore();
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});
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it('shows \'else\' template', function (done) {
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var fn = sinon.spy(),
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inverse = sinon.spy(),
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optionsData = {name: 'prev_post', fn: fn, inverse: inverse};
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helpers.prev_post.call({}, optionsData).then(function () {
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fn.called.should.be.false;
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inverse.called.should.be.true;
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done();
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}).catch(function (err) {
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done(err);
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});
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});
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});
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});
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